Don't walk around barefoot or you'll catch a cold

Why do parents say "Don't walk around barefoot or you'll catch a cold"?

The nasal mucosa is a natural barrier that prevents viruses from penetrating the body.

Walking barefoot or without enough clothes on causes the nose temperature to drop a few degrees. With this change in temperature many people suffer nose irritation symptoms such as sneezing and a runny nose. These changes in the nasal mucosa and runny nose can make it easier for any viruses present in the nose to penetrate the body.